SOCKET编程 发送邮件程序 返回验证密码时出错

[apexMing]

        memset(m_cSendBuff,0,sizeof(m_cSendBuff));  
        Char2Base64(m_cSendBuff,m_sMailInfo.getUserPassword(),strlen(m_sMailInfo.getUserPassword()));  
        m_cSendBuff[strlen(m_cSendBuff)]='\r';  
        m_cSendBuff[strlen(m_cSendBuff)]='\n';  
        send(sock,m_cSendBuff,strlen(m_cSendBuff),0);//发送用户密码  
        recv(sock,m_cReceiveBuff,1024,0);  
        if(m_cReceiveBuff[0]!='2' || m_cReceiveBuff[1]!='3' || m_cReceiveBuff[2]!='5')  
        {  
            return false;  
        }  

如上，在验证密码的时候总是返回false，初次解除scoket编程，不知道问题出在哪，求赐教

[apexMing]

recv返回的数据m_cReceiveBuff内容为 550 User Is Locked i-spam GT for Coremail System (163-hosting[20121016])